The title means «Rabbit» in French.

Chapter 12:

L(apin):

Many people thought that Skull and Renato had a conflicting relation. It was nothing next to the relation Skull/rabbit. If the other Arcobaleno had to describe the difference between both, it would be as to try to compare a fight in the school playground and a war between Famiglia.

ㅎㅎㅎㅎㅎㅎㅎ

The first time when they had witnessed the relation Skull/rabbit, it was for Easter.
Luce had woken them with a bang then to distribute baskets, before slamming the door by wishing good luck to them. Thus they were naturally of excellent humor.
For proof, Renato did not try to dislodge the head of Skull on his shoulder (on the other hand, he used the stuntman as support not to collapse on the ground).
Thus it was the troop of zombies that roamed on the mountain.
During one hour, the small group roamed in the forest, parting little by little. Suddenly, a cry of rage resounds, followed by a roaring of laughter.

Fon, Verde, Lal and Viper rode up in a small clearing, finding Renato dying laughing (in every sense of the word) and Skull calling very colored names at a… rabbit (and who seemed sporting an expression of smugness)?! It's at this moment they realized that the rabbit had the basket of Skull between his legs. The latter will shake a front leg as to say goodbye and disappeared in ferns under the roaring of Skull.

(Surprising, every time Skull had a nap outside, a troop of young rabbits joined him and slept with him. And every time, Skull grumbled about their innocence soon destroyed by " these old fossil ", whatever that means.)